Hi Frans,

Looking through the available item in the TpedList I came across the the DataSet. I know that the TypedList returns as a DataTable.

But when I use:

 pageTree.DataSet.Relations.Add("NodeRelation", pageTree.DataSet.Tables[0].Columns["PageID"], pageTree.DataSet.Tables[0].Columns["ParentPageID"]);

I get - Object reference not set to an instance of an object.

Any ideas?

UPDATED: I have been doing this:

          DataSet ds = new DataSet();
         ds.Tables.Add(pageTree);
         ds.Relations.Add("NodeRelation", ds.Tables[0].Columns["PageID"], ds.Tables[0].Columns["ParentPageID"]);

Which works fine.

You first have to add the typed list to the dataset, then add the relation object

Not the above then? I have another a look at this Thanks.